Bump sphinx from 7.3.7 to 7.4.4

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.3.7 to 7.4.4.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v7.3.7...v7.4.4)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

docs/requirements.txt

@@ -1,4 +1,4 @@
 -r ../requirements.txt
-sphinx==7.3.7
+sphinx==7.4.4
 sphinx_rtd_theme==2.0.0
 sphinxcontrib-svg2pdfconverter==1.2.2